Double diamond ruler



FIG. 1 is a front perspective view of a double diamond ruler;

FIG. 2 is a right-side elevational view wherein the left-side elevational view being a mirror image thereof;

FIG. 3 is a top plan view wherein the bottom plan view being a mirror image thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof.

The broken line showing of a double diamond ruler is for the purpose of illustrating environmental structure and forms no part of the claimed design. 

The ornamental design of a double diamond ruler, as shown and described. 